Minn Kota - MKR-US2-11 Universal Sonar 2 Extension - 10' - 1852080. Extension cable allows for an additional 10ft length. Universal Sonar 2 delivers advanced water temperature sensing and DualBeam PLUS technology for the best view of the waters below. These adapters connect your trolling motor to your favorite brand of sonar or fishfinder with IP-68-rated waterproof connectors. (200 kHz and 200/83 kHz DualBeam PLUS compatible).. 14-1/2' Universal Sonar 2 extension cable for use with all accessory adapter plugs. Length - 10'